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Umrsn STATES PATENT OFFICE.

WILLIAM GEORGE \VHITE, OF ANERLEY, COUNTY OF SURREY, AND ROBERT ALFREDALBERT WHITE, OF ORAYFORD, COUNTY OF KENT, ENGLAND.

POLYCHROMATlC-PRINTING BLOCK.

SPECIFICATION forming part of Letters Patent No. 386,859, dated July 31,1888.

Application filed February 21, 1888. Serial No. 264.839.

(No specimens.) Pati-ntcd in England May 24. 1881, No. 2,274.

To aZZ whom, it may concern:

Beit known that we, \VILLIAM GEORGE WHITE, residing at Th urlow House,VVeightou Road, Anerley, in the county of Surrey, England, engineer, andROBERT ALFRED ALBERT WHITE, residing at Orayford, in the county of Kent,England, subjects ofthe Queen of Great Britain, have invented certainnew and useful Polychromatic Printing, (for which we have IO receivedLetters Patent in Great Britain, No.

2,274, dated May 24, 1881,) of which the following is a specification.

This invention relates to that system of color-printing known as thepolychromatic I5 simultaneous system, in which the printing block isbuilt up of suitably-prepared materials containing the various colorswhich the design requires, and in which the printingblock so built up ofcoloring materials imparts a portion of its own substance to the fabricor surface to which it is applied.

Our present invention relates to the preparation of aniline dyes foruse, in the manner above set forth, in polychrome printing- 2 5 blocks.For this purpose we first dissolve the dye in a suitable solvent--suchas methylated spirit or water-and add a solution of gum or albumen. Weplace the mixture in trays in a heated chamber and evaporate to dryness.

The dye or color so treated and dried we then finely grind or pulverizeand mix with fatty ingredients. Thefollowing aresuitable: sheeps fat,one hundred parts; bleached beeswax, fifteen parts; sperm-wax, fifteenparts; paraffine,

5 eight parts; Venetian turpentine,eighty parts; poppy or moss oil, tenparts; linseed oil, (boiled) eighteen parts.

\Ve sometimes mix china-clay,as well as gum or albumen, with the dyecolors before combining them with the fatty ingredients.

We sometimes make use of pigment colors in the same composition withaniline colors.

Ve prefer to proceed as follows: \Ve dissolve the coloring-matter in thesolvent and add thereto well-washed china-clay and a so lntion ofgum-arabic or like gum. The proportions we use are: one ounce of thedye-color; two pounds of washed china-clay; one pound of gum; one gallonof water. After mixing these materials well together the mixture isplaced in shallow earthenware trays, and in a heated chamber themoisture is evaporated. Other white inert pigment-like materials may besubstituted for china-clay; but china-clay is preferred. The dry dyecompound so obtained is ground fine in a granite-mill, and is then mixedwith the fatty composition above given, in the proportion of two poundsof the former to one pound of the latter. The color so prepared is thenready for use in the production of the printing-block for polychromicprinting, and the printing is conducted as is usual in this process. Thecolor-block, being formed as described, is made to any suitable size orthickness-say one yard by six inches thick. It is then placed inamachine and cut or split into veneers or slabs of any requiredthickness, is then joined in one continuous sheet and bent round thecylinder of printingmachine, which is then ready for continuousprinting, and, after printing, the finishing operations are thosecommonly employed in the polychromic process. The grease is extractedfrom the fabric by means of sawdust or like material saturated Willinaphtha or benzine 7 spirit or other solvent. The goods are then steamedand afterward washed, all of which are well-known and usual operations.

What we claim is A mixture for blocks to be used in polychro- 80 maticprinting, consisting of an aniline dye, fat, beeswax, sperm-wax,paraffine,turpentine, poppy or moss oil, and boiled linseed-oil,substantially in the proportions described.

WILLIAM GEORGE WHITE. ROBERT ALFRED ALBERT WHITE. \Vitnesses:

GEO. J os. FRANKLIN, ARTHUR R. SKERTEN, Both of 17 Gracechurch Street,London, E. C.

